Circulation system for pulp digesters



Aug. 4, 1925.

K. K. MORTERUD CIRCULATION SYSTEM FOR PULP DIGESTERS Filed July 2. 1924 dmvtw I aim: JWW

Patented Aug. 4, 1925.

UNITED STATES KNUT KRIS'I'OFFER MORTERUD, F TORDEROD, NEAR MOSS, NORWAY.

CIRCULATION SYSTEM roa PULP measrnas.

Application filed July 2,

To all whom it may concern:

Be it known that I, KNUT KRISTOFFER MORTERUD, a subject of the King of Norway, residing at Torderod, near Moss, Norway, have invented certain new and useful Improvements in Circulation Systems for Pulp Digesters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying draw- 1 ings, and to letters or figures of reference marked thereon, which form a part of this specification.

In the digesting of vegetable materials for the manufacture of pulp it is customary to use artificial circulation of the digesting liquid, preferably heating the latter in a calorisator. The direction of flow inside the digester is usually vertical upwards or downwards. I

It has, however, been-found when materials are treated, the individual parts of which have great length in comparison to breadth, such as for instance st-raw, that the material is liable to pack inlumps whereby there are created zones with deficient circulation of liquid.

The explanation of this fact lies therein that these materials during thefilling operation are liable to pack in such av manner that the liquid flows easier near the circumference of the digester than in the middle thereof. I i

The present invention has forits object an arrangement by which it is made possible to direct the flow of liquid inside the digester at will in all planes, vertically and horizontally as well as at angles, and towards as well as away from the digester.

In the drawing are diagrammatically illustrated two 'forms of the invention in F i s. 1 and 2. c eferring to Fig. 1 there is located'inside the digester a number of annular perforated tubes 0;, which all communicate with the external tube 1) through valves or cocks 0.

Near the bottom of the digester a sieve or screening surface 7 may be substituted for the perforated annular tube a in order to facilitate the blowing out of the digester. Centrally in the digesterthere is located a perforated tube, 0 which is divided into 4 separate sections by means of transverse r a calorisator outside the 1924. Serial No. 723,737.

walls 9. Each section of tube 0 is connected through a valve or cock h with a common tube 11?.

Tubes 12 and (1! both communicate with the pressure tank 73 as well as with the intake 7: of a pump Z, cocks or valves m, n and o, 1) being provided in the outlet from the calorlsator and the intake to the pump, so as to connect the same either with 1; or d and cut off the connection with the other tube.

By means of the several cocks or valves 6, h, m, n, 0*, p it is possible to control the direction of flow of the liquid inside the digester in a number of different ways, and it is also possible to reverse the direction of flow by means of cocks m, 'n.

The form of the invention illustrated on Fig. 2 differs from the form illustrated on Fig. 1 principally therein that valves 6 and it are mounted inside the digester, all valves e and all valves it being combined in separate casings. As the valves in this case will not necessarily have to be absolutely pressure tight, this form of 'the invention will be somewhat cheaper than the one illustrated onFig. 1. 9

Claims 1. In a pulp digester, a digesting vessel, 8. calorisator outside the digesting vessel and a pump for circulating liquid through said digesting vessel and calorisator, a perforated tube mounted centrally in said digesting ves- I sel, one or more annular perforated tubes surrounding said centrally disposed tube and spaced from one another in the digesting vessel, and suction and pressure tubes connecting said centrally disposed and annular perforated tubes with the pump and calorisatqr,

2. In a pulp igester, a digesting vessel tli esting vessel and a pump for circulating liquid through said digesting vessel and calorisator, a perforated tubedivided longitudinally in two or more independentpartsmounted centrally in said digesting vessel, one or more another in the digestin vessel and suction and pressure tubes provided with .valvesfor connecting one or more of said independent parts'of the central tube andone or more of the annular tubes with the pumpintake or calorisator outlet. 3. In a pulp digester, a digesting vessel, a

annular perforated tubes'surrounding' said, I centrally disposed tube and spaced from one calorisator associated therewith, a pump for circulating liquid between the digesting vessel and the calorisator and laterally spaced li uid distributing and collecting means for said circulating liquid, at least one of said means comprising a plurality of elementsspaced longitudinally of the digesting Vessel to deliver, or collect said liquid in spaced zones so as to thereby produce an inclined flow of liquid within the digesting vessel presence of two subscribing witnesses.

KNUT KRISTOFFER MORTERUD.

Witnesses:

MANGUS BI'iGGE, GULBORG GULBRANDBEN. 

